Social Security Act 1991

A person is a relative (other than a parent) of a child if:

the person is not the child’s parent or step‑parent; and

any of the following apply to the person:

the person is related to the child by blood, adoption or marriage;

if the child is an Aboriginal or Torres Strait Islander child who has traditional Aboriginal or Torres Strait Islander kinship ties—the person is related to the child under Aboriginal or Torres Strait Islander kinship rules;

if the child is a member of a community that accepts relationships other than those referred to in subparagraphs (i) and (ii) as kinship ties—the person is accepted by the community to be related to the child.

For the purposes of subparagraph (1)(b)(i), if one person is a relationship child, or a step‑child, of another person, relationships traced to or through the person are to be determined on the basis that the person is related by blood to the other person.